http://www.swpc.noaa.gov/products/notifications-timeline
Many geomagnetic impulses in the days before the event, without
became a storm.

http://www.blitzortung.org
Absence of local lightning activity in north Italy.

Monitoring St.
01 - IK1QFK CUMIANA (TO), NW Italy
Geophone and Marconi antenna, 6214641 event marked with
vertical white arrow. Schumann Resonances are on background
but very interfered by signals coming from main network: all
those horizontal lines. At very low frequency a signal like an
hiss coming from a solar panel station, generated by inverter
during the night. Seismic wave on top inside the dotted
oval. No RF signals correlated with earthquake event.

Monitoring St. 02 - CSP VLF MONITORING STATION
From Pontese dew (TO), NW Italy ADA floating electric field receiver on
top, and aerial loop on bottom, 6214641 event
marked with vertical black arrow. Strong statics
activity evidenced in electric field and in magnetic
field with many tweaks. Russian Alpha radionavigation
carriers on top between 1800 and 15000 Hz. No RF
anomalies correlated with earthquake event.